Uncertainties in Triaxial Residual Stress Measurements

Goudar, D. M.; Hossain, S; Truman, Christopher E; Kingston, E.; Smith, David J.

doi:10.4028/www.scientific.net/msf.681.498

Cited by 2 publications

(4 citation statements)

References 4 publications

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“…A recent advance of the DHD technique, called incremental deep hole drilling (iDHD), has been developed specifically to enable measurements of residual stress in thick-sectioned components when the residual stress state is multi-axial and close to yield. [16] Full details of the iDHD technique are given in reference [17].…”

Section: Incremental Deep Hole Drilling (Idhd)mentioning

confidence: 99%

The influence of quench sensitivity on residual stresses in the aluminium alloys 7010 and 7075

Robinson

Tanner

Truman

et al. 2012

Materials Characterization

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The most critical stage in the heat treatment of high strength aluminium alloys is the rapid cooling necessary to form a supersaturated solid solution. A disadvantage of quenching is that the thermal gradients can be sufficient to cause inhomogeneous plastic deformation which in turn leads to the development of large residual stresses. Two 215 mm thick rectilinear forgings have been made from 7000 series alloys with widely different quench sensitivity to determine if solute loss in the form of precipitation during quenching can significantly affect residual stress magnitudes. The forgings were heat treated and immersion quenched using cold water to produce large magnitude residual stresses. The through thickness residual stresses were measured by neutron diffraction and incremental deep hole drilling. The distribution of residual stresses was found to be similar for both alloys varying from highly triaxial and tensile in the interior, to a state of biaxial compression in the surface. The 7010 forging exhibited larger tensile stresses in the interior. The microstructural variation from surface to centre for both forgings was determined using optical and transmission electron microscopy. These observations were used to confirm the origin of the hardness variation measured through the forging thickness. When the microstructural changes were accounted for in the through thickness lattice parameter, the residual stresses in the two forgings were found to be very similar. Solute loss in the 7075 forging appeared to have no significant effect on the residual stress magnitudes when compared to 7010.

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Section: Incremental Deep Hole Drilling (Idhd)mentioning

confidence: 99%

The influence of quench sensitivity on residual stresses in the aluminium alloys 7010 and 7075

Robinson

Tanner

Truman

et al. 2012

Materials Characterization

View full text Add to dashboard Cite

show abstract

“…They relate to the uncertainty in air‐probe calibration, U AP , and the uncertainty in material constant, U MC . [ 21,32 ]…”

Section: Error Analysis For Residual Stress Measurementmentioning

confidence: 99%

“…They relate to the uncertainty in air-probe calibration, U AP , and the uncertainty in material constant, U MC . [21,32] A further source of uncertainty relates to LVDT, U AX , used for measuring axial distortion. This is relevant to the iDHD technique.…”

Section: Error Analysis For Residual Stress Measurementmentioning

confidence: 99%

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Advances in analysis of total uncertainties in a semi‐invasive residual stress measurement method

Hossain

Zheng²,

Goudar

2020

Strain

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The ability to characterise residual stress distribution accurately and over different length scales, particularly deep into an engineering part, plays a significant role in assessing structural integrity. Two most commonly used techniques to measure residual stress fields deep into engineering components include neutron diffraction (ND) and deep‐hole drilling (DHD). As the measurements depend on several physical quantities, they are susceptible to error. The error or uncertainties may turn substantial and compromise the suitability of the results. Although noninvasive, the neutron diffraction technique is neither readily available nor portable and is limited to approximately 60‐mm‐thick specimen; errors associated with results become unacceptable at greater flight paths. Moreover, a mock‐up representing the engineering component is normally used in the ND technique. In contrast, the DHD technique is portable and measures residual stresses with high spatial resolution. An error propagation technique was applied to develop an error analysis procedure taking into consideration various stages of the DHD method and successfully applied to different DHD measurements. An essential feature comprising the effect of plasticity due to the creation of reference hole in the DHD procedure has not yet been taken into account in the error analysis procedure. This paper briefly describes how the uncertainties due to the creation of the initial reference hole can be determined. The effect of plasticity in the drilling procedure is quantified in this study. This error is combined with other sources of error and formulated to determine the total error. An incremental DHD technique was used to measure the complex triaxial residual stress field in an as‐welded circular disc, and the measured data were used to illustrate the total error using the error analysis method developed in the study.

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Uncertainties in Triaxial Residual Stress Measurements

Cited by 2 publications

References 4 publications

The influence of quench sensitivity on residual stresses in the aluminium alloys 7010 and 7075

The influence of quench sensitivity on residual stresses in the aluminium alloys 7010 and 7075

Advances in analysis of total uncertainties in a semi‐invasive residual stress measurement method

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